Abstract
This work reports on the bioassay-guided isolation and identification of the macrocyclic pentolide 1, a cyclic polyhydroxybutyrate (PHB) with low molecular weight. This metabolite is produced by Burkholderia sp. and it exhibited phytotoxic activity in a Lemna minor bioassay. Its structure was determined by 1H and 13C NMR, heteronuclear multiple quantum correlation, heteronuclear multiple bond correlation, IR, and electrospray ionization tandem mass spectrometry analyses. The period for maximum production of the pentolide was optimized and determined on the basis of multiple reaction monitoring experiments at 15 days. The potential of Burkholderia sp. as a producer of higher biopolymers of PHB was also investigated. The methodology employed here accelerated the isolation and characterization of a phytotoxic metabolite whose structure can serve as a model for the synthesis of new classes of herbicides.
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Petta, T., Raichardt, L., Melo, I.S. et al. Bioassay-Guided Isolation of a Low Molecular Weight PHB from Burkholderia sp. with Phytotoxic Activity. Appl Biochem Biotechnol 170, 1689–1701 (2013). https://doi.org/10.1007/s12010-013-0292-1
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DOI: https://doi.org/10.1007/s12010-013-0292-1